Cone-type crushers with shock pad between frame and adjustment ring



7 I. D. COOK CONE-TYPE CRUSHERS WITH SHOCK PAD BETWEEN Sept. 5, 1967FRAME AND ADJUSTMENT RING Filed Dec. 17, 1964 2 Sheets-Sheet l INVENTOR.IVO D. COOK ATTORNEYS Sept. 5, 1967 1. D. COOK CONE-TYPE CRUSHERS WITHSHOCK PAD BETWEEN FRAME AND ADJUSTMENT RING Filed Dec. 17, 1964 2Sheets-Sheet 2 INVENTOR. IVO D. COOK F/G. 6. (PR/0R ART) ATTORNEYSUnited States Patent Ofiice CONE-TYPE CRUSHERS WITH SHOCK PAD BE- TWEEN.FRAME AND ADJ USTMENT RING Ivo D. Cook, Hurley, N.,Mex., assignor toKennecott Copper Corporation, New York, N.Y., a corporation of New YorkFiled Dec. 17, 1964, Ser. No. 419,143

Claims. (Cl. 241-290) ABSTRACT OF THE DISCLOSURE Summary of inventionThis invention relates to cone-type crushers as extensively used forintermediate crushing operations applied to ores and'other rockmaterials.

This type of crusher is known generally as a Symons and operates on agyratory principle. A cone-shaped head, covered by a hardened steelmantle, is mounted for gyratory movement within and relative to astationary bowl, which has a hardened steel liner. The bowl is providedexteriorly with large and coarse threads, .which mate with correspondingthreads internally of an adjustment ring and enable the bowl to beturned during operation of the crusher for adjusting the settnig withrespect to the head to thereby control the gap between head and bowL Theadjustment ring rests on a receiving rim of a stationary frame, and isnormally held down tightly against such rim by bolts, which pass throughcoiled, tensioning springs. The bolts are adjusted so that the springsare tensioned sufficiently to hold the adjustment ring against the rimof the frame during normal crusher loads. However, under excessive loadsand the presence of tramp iron or the like, the springs undergocompression and the adjustment ring and bowl are free to rise with thehead and relieve excessive stresses and strains.

Due to this freedom of movement of the adjustment ring relative to itssupporting seat on the main frame of the machine,wear occurs between themutually engaging surfaces. Periodic rotation of the adjustment ringrelative to the frame is required to even out the wear. This is not aneasy job on such a large and heavy machine, and necessitatesinterruption of the continuity of operation of a mill where a sequenceof operations are dependent upon continuing operation of one or morecrushers.

A principal object of the present invention is to eliminate wear betweenthe adjustment ring and the stationary frame, whereby the need forrotating the adjustment ring on its seat and the periodic work stoppagesoccasioned thereby are eliminated.

This object is effectively accomplished in accordance with the inventionby modifying the ring and frame of such a crusher to accommodatetherebetween a flexible and resilient shock pad of readily compressiblematerial, such as natural rubber, for resiliently supporting theadjustment ring. It has been found that the interposing of such a shockpad between ring and frame eliminates wear, without interfering withproper action of the crusher.

There is shown in the accompanying drawings a specific embodiment of theinvention representing what is 3,339,856 Patented Sept. 5, 1967presently regarded as the best mode of carrying it out in practice. Fromthe detailed description of this presently preferred form, otherspecific objects and features of the invention will become apparent.

In the drawings:

FIG. 1 represents a top plan view of a standard Nordberg-Symons conecrusher modified to incorporate the unique features of the invention;

FIG. 2, a fragmentary vertical section taken on the line 2-2 of FIG. 1;

FIG. 3, a horizontal section taken on the line 33 of FIG. 2;

FIG. 4, a fragmentary vertical section taken on the line 4-4 of FIG. 3and drawn to a larger scale;

FIG. 5, a similar fragmentary section taken on the line 55 of FIG. 3;and

FIG. 6, a view corresponding to the significant portion of FIG. 2, sofar as the invention is concerned, but show-' ing the prior art, i.e.convention, construction for comparison with the inventive constructionof FIG. 2.

Referring to the drawings:

The illustrated cone-type crusher is a standard Nordberg-Symons,manufactured by Nordberg Manufacturing Company, Milwaukee, Wis., whichhas been modified in accordance with the invention.

As is customary, the illustrated machine includes a cone-shaped head 10covered by a hardened steel mantle 10a and mounted for gyration inconvention manner within a stationary bowl 11 having a hardened steelliner 11a internally thereof. The bowl 11 is threaded into an adjustmentring 12 by means of large and coarse threads 13.

Adjustment ring 12 rests on a stationary, structural frame 14 forupwardly yielding movement away from such frame when loading of materialto be crushed between head and bowl is excessive or when the feedcontains uncrushable foreign material, such as tramp iron. Tensionedcoil springs 15 and bolts 16 provide for yieldability in conventionalmanner by means of a ratchet mechanism and Windlass post 17, FIGS. 1 and2, operable to rotate adjustment ring 12 on its threads 13 for purposesof adjustment.

As conventionally constructed, see FIG. 6, the stationary frame and theadjustment ring have sets of mated, bevelled surfaces 18 and 19,respectively, normally maintained in contact, but free to move relativeto each other by reason of the aforesaid yieldable mounting of theadjustment ring on the stationary frame. The adjustment ring normallyrests on the stationary frame, with the weight bearing directly onsurfaces 18 through the overlying surfaces 19. This is the thing thatcauses difficulty in practice due to excessive. wear between such matedsurfaces 18 and 19, which necessitates removal vand rotation of the ringto a new setting, usually from the old setting.

In accordance with the invention, existing machines are modified and newmachines are constructed to include shock pad means between mutuallyspaced and opposed surfaces of adjustment ring and stationary frame, sothe mated surfaces 18 and 19 will be held slightly apart, see theexaggerated showing of this in FIG. 2.

Thus, in the form illustrated, a flange extension 20, FIGS. 2-5, isprovided peripherally of the upper rim 21 of the stationary frame 14,and a mating flange extension 22 is provided peripherally of the normalflange portion 23 of adjustment ring 12. These flange extensions arespaced apart sufliciently to receive a compressible shock ring 24, FIG.2, of flexible, resilient, natural-rubber-like material therebetween. Ashock ring made of 65-70 durometer, live, natural rubber and A of aninch in thickness, put under compression of of an inch by tightening thebolts 16 so the conventionally-contacting sets of mated surfaces 18 and19, FIG. 2, are spaced ever so slightly apart has been found to preventwear between adjustment ring and stationary frame over very long periodsof entirely satisfactory crushing surface rendered by the machine. Themated surfaces 18 and 19 can even be practically in face-to-facerelationship, considering the fact that the compressed shock pad ratherthan the surfaces 18 bears the weight of the adjustment ring and thatthere is substantially no pressure relationship between the surfaces 18and 19.

The resiliency and compressibility of the shock ring are important. Whena ring made of 65-70 durometer, Buna-N, synthetic rubber was tried,there was not a sufficient degree of compressibility and too greatspacing between the sets of mated surfaces 18 and resulted. This led toa slight but undesirable wobble of the adjustment ring when extremelyhard ore was being crushed. Thus, the shock ring should havecompressibility equivalent to live natural rubber, and good judgmentbased on the type of ore to be crushed must be exercised in thetightening of the bolts 16.

Existing crushers can be modified in different ways to conform to thisinvention. Thus, the entire upper part of the conventional stationaryframe can be cut off just below the reinforcing gusset plates normallyprovided, and an entirely new section welded on. The new section ispreferably cast to proper formation with the extension flange 20.Lifting hooks 26 and gusset plates 27 are then welded thereto. Again,the worn portions of the conventional stationary frame can be built upby the use of welding techniques and machining, and a flange extension,lifting hooks, and additional gusset plates welded on.

In either case, the opposing surfaces of the flange extensions should bemachined smooth for best results.

Newer forms of the stationary frame of a Nordberg- Symons cone crusherare provided with an outwardly extending flange of sufiicient projectionto make it unnecessary to make any modification prior to replacing theconventional adjustment ring with the modified ring of the invention.For these newer machines, it will be unnecessary to do more than modifythe adjustment ring, by the addition thereto of a mating flange aspreviously described, and apply the modified ring to the existingstationary frame with a shock ring 24 interposed between the flanges ofadjustment ring and frame.

Although it is preferred to make the mating or mutually confrontingflanges continuous peripherally of both frame and adjusting ring and toprovide the shock pad as a ring, such flanges can be made discontinuous,as projecting lugs, so long as they are symmetrically placedpeirpherally of frame and ring. As such, individual shock pads would beprovided therefor.

Whereas there is here illustrated and specifically described a certainpreferred construction presently regarded as the best mode of carryingout the invention, it should be understood that various changes can bemade and other constructions adopted without departing from theinventive subject matter particularly pointed out and claimed herebelow.

I claim:

1. In a cone-type crusher which includes a stationary frame having anupper rim, an adjustment ring having a lower rim mated with the said rimof the stationary frame, a bowl mounted within the adjustment ring, acone-shaped head mounted for gyration within and relative to said bowl,and resilient means normally holding said ring and said frame togetherwith their mated rims in mutually confronting relationship, shock padmeans of flexible, resilient, natural-rubber-like material interposedand compressed between said frame and said ring so as to support saidring and maintain said mated rims in substantially non-pressurerelationship.

2. The structural combination recited in claim 1, wherein the shock padmeans is a ring.

3. In a cone-type crusher which includes a stationary frame having anupper rim, an adjustment ring having a lower rim mated with the saidrimof the stationary frame, a bowl mounted within the adjustment ring, aconeshaped head mounted for gyration within and relative to said bowl,and resilient means normally holding said ring and said frame togetherwith their mated rims in mutually confronting relationship, peripheralflanges rigidly secured to and extending outwardly from the said rims,respectively, in mutually confronting relationship; and shock pad meansof flexible, resilient, natural-rubber-like material interposed andcompressed between the peripheral flanges of said frame and said ring soas to support said ring and maintain said mated rims in substantiallynon-pressure relationship.

4. The structural combination recited in claim 3, wherein the flangesare continuous peripherally of the frame and adjustment ring,respectively, and the shock pad means is a ring.

5. The structural combination recited in claim 3, wherein the flangeshave flat and smooth confronting faces which are substantially normal tothe vertical axis of the crusher and the shock ring has conforming flatand smooth faces at the opposite faces thereof.

References Cited UNITED STATES PATENTS 1,717,894 6/1929 Rumpel 241-290 X2,476,630 7/1949 Schindler 241-290 X 2,555,064 5/1951 Stevens et a1241-286 ANDREW R. JUHASZ, Primary Examiner.

1. IN A CONE-TYPE CRUSHER WHICH INCLUDES A STATIONARY FRAME HAVING ANRIM, AND ADJUSTMENT RING HAVING A LOWER RIM MATED WITH THE SAID RIM OFTHE STATIONARY FRAME, A BOWL MOUNTED WITHIN THE ADJUSTMENT RING, ACONE-SHAPED HEAD MOUNTED FOR GYRATION WITHIN SAID RELATIVE TO SAID BOWL,AND RESILIENT MEANS NORMALLY HOLDING SAID RING SAID SAID FRAME TOGETHERWITH THEIR MATED RIMS IN MUTUALLY CONFRONTING RELATIONSHIP, SHOCK PADMEANS OF FLEXIBLE, RESILIENT, NATURAL-RUBBER-LIKE MATERIAL INTERPOSEDAND COMPRESSED BETWEEN SAID FRAME AND SAID RING SO AS TO SUPPORT SAIDRING AND MAINTAIN SAID MATED RIMS IN SUBSTANTIALLY NON-PRESSURERELATIONSHIP.